Skip to content
NewMastershot Studio is open: a video editor with no watermark on anything you export. Try it free

Audio volume booster

Make an MP3, WAV, or any recording louder, up to 400%, without distortion. It’s free, and the audio never leaves your device.

Files stay on your device

Drop an audio file to make it louder

Turn up a quiet MP3, WAV, M4A, or recording, up to 400%, without distortion. It’s saved in the same format.

MP3, M4A, WAV, FLAC, and other audio, or a video with sound.

How to make audio louder

Open an MP3, WAV, M4A, or other audio file, drag the volume up, and press play to hear it before you save. The waveform shows how loud each part will be, and peaks that would go past full volume are held back instead of clipping. Choose Loudest without distortion to turn it up as far as it goes cleanly. The volume booster runs in your browser on Windows, Mac, Android, or iPhone, with nothing to install.

  1. Step 1

    Choose the audio
    An MP3, WAV, M4A, voice memo, or a video.

  2. Step 2

    Turn it up
    Drag the volume, or choose Loudest without distortion, and play it.

  3. Step 3

    Download it
    The louder copy, in its own format.

What to expect

Supported inputs
MP3, WAV, M4A, FLAC, Ogg, Opus, AAC, AIFF, and other audio this browser’s engine can read, and videos with sound.
What happens
The sound is turned up or down by the amount you choose and encoded again in the file’s own format. Turned up, peaks that would go past full volume are held just under it, so the louder sound doesn’t crackle. A FLAC or AIFF is saved as a WAV, also lossless, and a video keeps its picture as it is.
Limits
Volume goes from 0 to 400%. A quiet recording gets louder, but so does its background hiss.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

Open it here, drag the volume above 100% or choose Loudest without distortion, and select Change volume. The new MP3 plays louder in every player, not just this one.

It does the same job. MP3Gain raises an MP3’s volume in 1.5 dB steps without encoding it again. This turns it up by any amount, holds back peaks so they don’t clip, and encodes the MP3 again to do it.

No. Peaks that would go past full volume are held back a little instead of being cut off, which is what makes boosted audio crackle. The waveform marks those parts.

No. It works on a file on your phone or computer, not a link. Save the audio file first, then open it here.

Related tools